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A 9.6-mW/Ch 10-MHz Wide-Bandwidth Electrical Impedance Tomography IC With Accurate Phase Compensation for Early Breast
一款用于早期乳腺癌检测的10MHz宽频带电阻抗断层成像IC，具有高精度和小尺寸特点。
65nm CMOS, 10MHz带宽, 4.32°相位误差, 1.6mΩ/√Hz阻抗分辨率
电阻抗断层成像乳腺癌检测宽频带相位补偿高分辨率
▸宽频带仪表放大器(WB-IA)：采用高频宽频带设计，能够在10 MHz频率下检测癌细胞的大阻抗变化，显著提高了EIT图像的分辨率，实现了1.6 mΩ/√Hz的阻抗分辨率。
▸双模式驱动器(DM-driver)：通过消除复杂的开关网络，减少了系统噪声并缩小了系统尺寸，同时提高了驱动效率，使系统能够在低功耗（9.6 mW每通道）下稳定运行。
▸相位补偿环路(PCL)：有效校正相位误差至4.32°，确保图像准确性，避免了伪影问题，提升了系统的整体性能和可靠性。
▸高集成度设计：采用65-nm CMOS技术，芯片面积仅为16 mm²，实现了高集成度和低功耗，适合便携式医疗设备应用。
Abstract
An eight-channel 10-MHz wide-bandwidth electri- cal impedance tomography (EIT) IC is proposed for early breast cancer detection system. To increase the resolution of EIT images, the proposed IC has three key features: 1) wide-bandwidth instrumentation amplifier (WB-IA) to detect large impedance changes in cancer cells at a high frequency; 2) dual-mode driver (DM-driver) to obviate the complex switching network to reduce the noise and the system form factor; and 3) phase compensation loop (PCL) to efficiently correct the phase error for accurate images without artifacts. The proposed EIT IC occupies 16 mm 2 in the 65-nm CMOS technology and consumes 9.6 mW for each channel. Thanks to the key features, the proposed breast cancer detection system with the dedicated EIT IC can operate up to 10 MHz with a small phase error of 4.32 ◦ and a state-of-the-art impedance resolution of 1.6 m /Omega1/√ Hz eventually can detect a small-size target object of 0.5 cm and verify with the phantom experiments.